Why not respond to a 7 month old thread? I was not aware of an expiration date. What exactly is your time limit on threads?
If she is having exactly the same issue, what on earth is wrong with filing it under this thread?
If you know an answer, post it. If not, consider not posting. Your response was not helpful and led off in some vague direction. Consider changing your name from hatter to hater; it's more fitting.
So it is Feb 2015 and I am having this same issue. Safari (8.0.3) freezes and will not force quit. It freezes my whole Mac Pro. I cannot switch to another app by any means, and I cannot click the Apple menu in the upper left to select force quit. I cannot use the force quit key combination. It freezes the entire Mac (except the cursor) - all open apps, documents, etc. All unsaved data was lost when I accepted that holding down the power key was the only alternative. So it is a serious problem.
This thread, old as it is, comes up high in Google. So, if someone has the answer, post it here. This is where those with this issue will find the answer.